CN109211631B - Method for measuring reflow property of iron-containing furnace burden - Google Patents

Method for measuring reflow property of iron-containing furnace burden Download PDF

Info

Publication number
CN109211631B
CN109211631B CN201811075382.9A CN201811075382A CN109211631B CN 109211631 B CN109211631 B CN 109211631B CN 201811075382 A CN201811075382 A CN 201811075382A CN 109211631 B CN109211631 B CN 109211631B
Authority
CN
China
Prior art keywords
iron
melting
sample
furnace
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201811075382.9A
Other languages
Chinese (zh)
Other versions
CN109211631A (en
Inventor
吴铿
马小青
张文哲
付中旺
尉迟贺鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Science and Technology Beijing USTB
Original Assignee
University of Science and Technology Beijing USTB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Science and Technology Beijing USTB filed Critical University of Science and Technology Beijing USTB
Priority to CN201811075382.9A priority Critical patent/CN109211631B/en
Publication of CN109211631A publication Critical patent/CN109211631A/en
Application granted granted Critical
Publication of CN109211631B publication Critical patent/CN109211631B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
    • G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • G01N2001/2866—Grinding or homogeneising

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention relates to the technical field of blast furnace iron making, and provides a method for representing the reflow property of iron-containing furnace burden, wherein the iron-containing furnace burden is ground into a sample, when the sample is prepared, the iron-containing furnace burden and coke are ground to the granularity of less than 147 mu m, a cylindrical sample and a gasket sample are respectively prepared on a high-pressure tablet press, and the coke content is 0-30% of the total mass of the sample; and (3) taking the relative change degree of linear displacement after the maximum expansion amount of the sample in the reduction reaction melting experiment as a characteristic quantity to represent the reflow melting performance of the iron-containing furnace charge. The method utilizes a reduction reaction melting test to determine the soft melting performance of the iron-containing furnace charge, and the soft melting performance of the blast furnace charge structure is a very important factor influencing the characteristics of a soft melting zone during the reduction reaction; the main characteristics of iron-containing furnace burden in a blast furnace soft melting zone can be simulated by a reduction reaction melting test; the method can partially replace the traditional high-temperature molten drop test; the method is simple and reasonable and has wide application prospect.

Description

Method for measuring reflow property of iron-containing furnace burden
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to a method for measuring the reflow property of iron-containing furnace burden.
Background
In the iron-making process, the high-temperature molten drop characteristics of different furnace charge structures need to be researched to ensure the stable and smooth operation of the blast furnace. Under the condition of unchanged coke strength and granularity of iron-containing charging materials, the air permeability of the charging column in the blast furnace depends on the shape and the reflow property of the reflow zone of the iron-containing charging materials. The width and height of the blast furnace reflow zone greatly affect the air permeability of the blast furnace and the smooth operation of the blast furnace.
The current method for measuring the soft melting performance of the iron-containing furnace burden is mainly to measure through a molten drop test and use parameters such as pressure difference, load soft melting temperature, characteristic value S and the like to represent. Using N for the molten drop test2The CO is 70:30 reducing gas, the added coke directly participates in the reaction in a high-temperature zone, and the reduction reaction of the molten drop process comprises direct reduction and indirect reduction. In the molten drop test, a weight is applied to a sample in order to quickly drop a molten substance, and the test is called a softening under load test. The samples used in the droplet tests are all from the raw materials of the production site, anda non-compositionally homogeneous chemical agent. The volumes of different molten drop devices are different, and the volumes of the devices tend to be greatly developed. At present, the high-temperature molten drop test has no national standard and only has an industry universal method.
The melt-drip test has the advantages of long experimental period, time consumption and high labor cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for representing the soft melting performance of iron-containing furnace burden, wherein the soft melting performance of the iron-containing furnace burden is measured by using a reduction reaction melting test, and the soft melting performance of a blast furnace burden structure is a very important factor influencing the characteristics of a soft melting zone during the reduction reaction; the main characteristics of iron-containing furnace burden in a blast furnace soft melting zone can be simulated by a reduction reaction melting test; the method can partially replace the traditional high-temperature molten drop test.
The technical scheme of the invention is as follows:
a method for determining the reflow property of iron-containing furnace burden comprises the following steps of grinding the iron-containing furnace burden to prepare a sample; and measuring the reflow property of the iron-containing furnace charge by using the relative change degree of linear displacement after the maximum expansion amount of the sample in the reduction reaction melting experiment as a characteristic quantity.
Further, the characteristic quantity is a melting parameter RHFThe calculation formula is as follows:
RHF＝ΔT/T1×ΔH×100 (1)
wherein: t is1For melting shrinkage onset temperature, T2The temperature interval delta T is T as the end temperature of the reflow2-T1，H1Shrinkage height of sample material column shrinkage when maximum shrinkage is reached for the first time in reflow process), H2The displacement change rate is the displacement change rate when the sample material column generates maximum expansion in the reaction process, and is delta H ═ H2/H1。
Further, in the preparation of the sample, the iron-containing charge and the coke are ground to a particle size<147 μm, respectively making into cylindrical samples on a high-pressure tabletting machine
Figure GDA0002473824260000021
And a gasket sample with the diameter of 24mm × 4mm, wherein the coke content is 0-30% of the total mass of the sample, and for different ore types, such as sintered ore, pellet ore, lump ore and the like, the content of the coke required to be blended is adjusted within the range according to the difference of the ore types.
Further, different iron-containing furnace materials are respectively subjected to reduction reaction melting tests to obtain melting parameters RHFForming the melting parameter RH of various iron-containing furnace charges in different proportionsFA database of (a); establishing corresponding relations between different proportions of iron-containing furnace burden and the reflow property;
and adjusting the proportioning structure of the iron-containing furnace burden in the blast furnace ironmaking process according to the database, thereby improving the high-temperature molten drop characteristic of the iron-containing furnace burden.
Further, the iron-containing furnace burden comprises single ore of natural iron ore blocks, sintered ore and pellet ore, or mixed ore of the natural iron ore blocks, the sintered ore and the pellet ore.
Further, the method adopts a test device comprising: the device comprises a high-temperature furnace, a sample table, a slide system for pushing the sample table, a temperature measuring system, a camera shooting and recording system, an air supply system and an information processing device;
the slide system sends the sample platform into or out of the high-temperature furnace, the gas supply system supplies gas for the high-temperature furnace, the thermocouple provides a heat source for the high-temperature furnace, the camera or the video camera shoots the change state of the sample in the test process, and the picture information is transmitted to the information processing device; the temperature measuring system inputs the temperature information into the information processing device through the signal converter.
Furthermore, the high-temperature furnace is a visual horizontal high-temperature furnace, and the rated power of the high-temperature furnace is 8 kw.
The invention has the beneficial effects that:
(1) the test process is visual and can be recorded in real time, the test equipment is much simpler than the molten drop test equipment, the cost and manpower consumed by spare parts and tests are low, and the aim of greatly reducing the detection cost is fulfilled; the cost of the test equipment is about 1/3 of the molten drop test, and the use cost and the labor cost are greatly reduced compared with the molten drop test.
(2) The phenomenon in the test process can be monitored at any time, and the difference of melting characteristics of different iron-containing furnace materials during reaction can be found in time;
(3) the test period is short, the melting characteristics of reduction reactions of various single iron-containing materials and different blast furnace burden structures can be rapidly analyzed, the technical analysis requirements of frequent change of new materials and rapid adjustment of the burden structures of the blast furnace are met, and necessary basis is provided for guiding the production of the blast furnace;
(4) the melting characteristic test in the reduction reaction can provide necessary information for the load molten drop test, and the two test results complement each other to provide more information for the adjustment of the blast furnace burden structure;
(5) the traditional high-temperature molten drop test can be partially replaced;
(6) the method is simple and reasonable and has wide application prospect.
Drawings
FIG. 1 is a schematic structural diagram of a testing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing the melting process of a sample of Rouyan mountain block during a reduction reaction.
FIG. 3 is a schematic view showing a melting process of a single sample of iron-containing charge during a reduction reaction;
wherein: fig. 3(a) is an australian block, fig. 3(b) is an atlas block, fig. 3(c) is a sintered ore 1, fig. 3(d) is a sintered ore 2, fig. 3(e) is a sintered ore 3, fig. 3(f) is a sintered ore 4, fig. 3(g) is a torpedo, and fig. 3(h) is a torpedo.
FIG. 4 is a schematic view showing the melting process of a mixed ore of two charge structures at the time of reduction reaction;
wherein: fig. 4(a) shows a charge material structure 1, and fig. 4(b) shows a charge material structure 2.
FIG. 5 is a schematic view showing a melting process of a mixed ore containing a high-basicity sintered ore at the time of reduction reaction;
wherein: fig. 5(a) shows a mixed charge structure 3, and fig. 5(b) shows a mixed charge structure 4.
FIG. 6 is a schematic view showing a reduction reaction visualization reflow process of the Alterlas block replacing other charging materials:
wherein: fig. 6(a) is a mixed ore corresponding to scheme 1, fig. 6(b) is a mixed ore corresponding to scheme 2, fig. 6(c) is a mixed ore corresponding to scheme 3, and fig. 6(d) is a mixed ore corresponding to scheme 4.
FIG. 7 is a graph showing the characteristic number of droplets in a single charge (lump ore and pellet ore) compared with the melting parameter of the reaction.
FIG. 8 is a graph showing the characteristic number of single charge (sinter) droplets compared with the reaction melting parameter.
FIG. 9 is a comparison chart of the characterization parameters of two methods for testing the reflow property of the mixed furnace charge.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects. In the drawings of the embodiments described below, the same reference numerals appearing in the respective drawings denote the same features or components, and may be applied to different embodiments.
Compared with the traditional high-temperature molten drop test and the characteristic value S, the invention passes through a new test method and the melting parameter RHFTo determine the soft-melting property of the iron-containing burden.
The test equipment used in the embodiment of the invention comprises: a melting process of iron-containing furnace burden during high-temperature reduction is researched in a simulation mode according to a visual horizontal high-temperature furnace (rated power is 8kw), a slide system for pushing a sample, a temperature measuring system, a camera and recording system, an air supply system and the like. The test equipment is shown in figure 1, and the gas supply system is used for supplying gas (CO + N) to the high-temperature furnace2) The thermocouple provides a heat source for the high-temperature furnace, and a camera or a video camera shoots the change state of the sample in the test process and transmits picture information to a computer (an information processing device); the temperature measuring system inputs temperature information into a computer (information processing device) through a signal converter.
The test process is as follows: the iron-containing charge and coke tested were ground to particle size<147 μm, respectively making into cylindrical samples on a high-pressure tabletting machine
Figure GDA0002473824260000041
The method comprises the steps of preparing a sample and a gasket sample with the diameter of 24mm × 4mm, testing and adding a proper amount (0-30%) of coke, and adjusting the content of the coke needed to be added according to the difference of ore types in the range according to actual or experience for different ore types, such as sintered ore, pellet ore, lump ore and the like.
The shape of the melting process of the iron-containing charge sample during the reduction reaction occurs: first contraction, second expansion and second contraction. This is due to the evolution of gases resulting from the reduction reaction in the sample. The rate of reduction volume expansion of the iron-containing charge and the duration of the reduction reaction in the blast furnace directly affect the permeability and thickness of the soft melt zone, while the temperature at which the reduction melting of the iron-containing charge begins may affect the height of the soft melt zone.
The melting characteristic of reduction reaction is characterized by using the relative change degree of linear displacement after the maximum expansion amount of the sample as a characteristic quantity, and the specific parameter is melting shrinkage starting temperature T1End temperature T of reflow2Temperature interval Δ T, displacement change rate Δ H. The displacement change rate Delta H is the displacement change rate when the sample material column generates the maximum expansion in the reaction process.
Definition of the melting parameter RH characterizing the reduction reactionFThe calculation formula is as follows:
RHF＝ΔT/T1×ΔH×100 (1)
wherein: t is1For the melting shrinkage onset temperature (temperature corresponding to FIG. 2 a), T2The temperature interval Δ T is T, which is the reflow end temperature (temperature corresponding to fig. 2 d)2-T1，H1The shrinkage height (FIG. 2b) at which the sample pillar shrinks when the reflow process reaches the maximum shrinkage for the first time (H)2From the first maximum shrinkage to the maximum after meltingThe swelling height of swelling (fig. 2c), the rate of change of displacement Δ H is the rate of change of displacement when the sample column undergoes maximum swelling during the reaction process, Δ H ═ H2/H1。
Melting parameter RHFThe thickness of the melting zone corresponding to a small middle melting temperature interval is also narrow, the melting starting temperature is high, the position of the soft melting zone is also low, and the influence of low displacement change rate on air permeability is small. Melting parameter RHFThe smaller the effect of the charge on the permeability during the reaction melting process.
In the following embodiments, the iron-containing furnace materials commonly used in blast furnaces of a certain plant are selected from the following materials: the chemical compositions of the Roihan blocks, the atlas blocks, the Australian blocks, the sinter 1-4, the Longhui titanium pellets and the Longhui pellets are shown in the table 1.
TABLE 1 chemical composition of iron-containing blast furnace material used in reduction reaction test
Figure GDA0002473824260000042
Figure GDA0002473824260000051
Table 2 shows a sample scheme of the melting behavior of different iron-bearing charges during the reduction reaction.
TABLE 2 Experimental protocol for melting behavior in reduction reactions
Figure GDA0002473824260000052
FIG. 2 shows the melting process of a sample of Roehan block in the presence of a reduction reaction.
FIG. 3 is a schematic diagram showing the melting process of Aurea lumps, Attapulgite, sinter and pellet during the reduction reaction.
The melting characteristics of the individual charges are given in Table 3.
TABLE 3 melting behavior parameters of a single charge during the reduction reaction
Figure GDA0002473824260000053
Figure GDA0002473824260000061
The method for maintaining the service life of the furnace hearth and the furnace bottom of the blast furnace for certain enterprises is observed, and the titanium-containing pellets are used in production to protect the furnace hearth and the furnace bottom. During production, the amount of the added titanium-containing pellets is correspondingly adjusted according to the temperature change of the hearth and the bottom of the furnace. Table 4 shows the charge structures of two different pellets that were charged into the furnace during normal production of the blast furnace of a certain enterprise.
TABLE 4 blast furnace burden structure in normal production
Figure GDA0002473824260000062
Table 5 shows the experimental scheme of the reflow behavior of the charge structures of two different pellets of the blast furnace during the reduction reaction in normal production.
TABLE 5 experimental scheme for the reflow behavior of two different charge structures of a blast furnace during reduction reaction
Figure GDA0002473824260000063
FIG. 4 is a schematic view showing the melting process of a mixed ore of two charge structures at the time of reduction reaction.
Table 6 gives the melting characteristics of the mixtures for the two charge structures.
TABLE 6 melting behavior parameters of mixtures of two charge structures during the reduction reaction
Figure GDA0002473824260000064
The melting behavior during the reduction reaction of a mixed charge containing sintered ores of different basicities (basicities of 2.53 and 2.31, respectively) was tested as follows.
Table 7 shows the structure of two types of burden containing high basicity sinter in a blast furnace test of a certain enterprise.
TABLE 7 blast furnace charge Structure/% containing high basicity sinter
Figure GDA0002473824260000065
Table 8 shows the reduction reaction reflow property test scheme of the blast furnace mixed burden in normal production.
TABLE 8 melting characteristic test scheme for mixture containing high alkalinity sinter during reduction reaction
Figure GDA0002473824260000071
FIG. 5 is a schematic diagram of the melting process of a mixture containing high basicity sintered ore during reduction reaction.
From the test results of fig. 5, the melting characteristics of the sintered ores of different basicities are given in table 9.
TABLE 9 melting characteristics of mixed ore containing high-basicity sinter during reduction reaction
Figure GDA0002473824260000072
As can be seen from Table 9, the melting parameter RH of the sinter mix with an addition basicity of 2.53FThe melting parameter RH of the sinter mixture with the alkalinity of 2.31 is added when the melting temperature reaches 16.68 DEGF7.22 is much higher, mainly due to the high rate of change of displacement. The melting parameter of the mixed furnace charge with the ultrahigh alkalinity is larger than the melting parameter RH of the single ultrahigh alkalinity sinterFThe values (see table 3) decrease, but the increase is still too large, so that the production of permeability in the blast furnace is adversely affected by the ultra-high basicity of the sintered ore.
The following table 10 shows the scheme of using the mixed iron ore instead of the australian lumps for iron ore reduction experiments, and is shown in table 11.
TABLE 10 Charge construction protocol/% using Attapulgite blocks instead of Australian blocks and pellets
Figure GDA0002473824260000073
TABLE 11 test protocol for the reflow behaviour of a blast furnace in reduction reactions using different protocols of mixed charge materials
Figure GDA0002473824260000074
Experiments were conducted with attras blocks in place of their australian lumps according to the protocol of table 11, and figure 5 visualizes the reflow process for reduction.
It can be seen from fig. 5 that when the proportion of the atlas mass is increased to 15% (case 4), the volume expansion of the sample during the reduction melting process is higher than that of the other cases.
Increasing the proportion of the atlas block to replace the melting characteristic parameter RH of the reduction reaction of other furnace chargesFAs shown in table 12.
TABLE 12 reduction melting characteristics of mixed charges with increased proportion of atlas lump ore
Figure GDA0002473824260000075
Figure GDA0002473824260000081
As can be seen from Table 12, the reduction melting parameter RH increases with the proportion of the Alterlas agglomeratesFThe increase is due to the increased rate of change of displacement. This is consistent with the increase in the sample volume expansion in figure 6 at the atlas block ratio, i.e., the increase in the severity of the reaction.
The melt drop test is taken as a method for testing the reflow performance of the traditional blast furnace burden structure, a certain load and reducing gas are used in the test process of the method, the actual state of a reflow zone of the blast furnace is simulated, and a melt drop characteristic value S is taken as one of key parameters for representing the characteristics of the reflow zone, so that the method is commonly known by domestic iron-making workers. The height, thickness, air permeability and the like of the position of the blast furnace reflow zone affect the distribution of gas flow in the blast furnace, and the reaction melting parameter of furnace burden during the reduction reactionThe number also directly affects the characteristics of the reflow tape. According to the single furnace charge and various furnace charge structures used by a blast furnace of a certain enterprise, the characteristic value (S) of molten drops and the reaction melting parameter (RH) are exploredF) The relevance of (c).
Table 13 shows the characteristic values of the droplets and their reaction melting parameters for a single iron-containing charge.
TABLE 13 characteristic values of the droplets and the reaction melting parameters of the iron-containing charge materials alone
Figure GDA0002473824260000082
As can be seen from table 13, the characteristic value of the molten drop of the sintered ore is much higher than that of other single iron-containing burden, wherein the value of the characteristic value of the molten drop of the sintered ore 2 is too large, and if the sintered ore is placed in the same graph with other single iron-containing burden, other values are too small to observe the regular characteristics visually. Therefore, they are separately mapped to determine their correlation.
Fig. 7 and 8 are graphs comparing the characteristic value of the molten drop of the single iron-containing burden (lump ore and pellet ore) and the single iron-containing burden (sintered ore) with the reaction melting parameter when the reduction reaction is melted, respectively.
As can be seen from FIG. 7, the characteristic numbers of the molten drops of the natural iron ore block and the titanium-containing pellet are respectively related to the change rule of the respective reaction melting parameters, and have better consistency respectively. If the natural iron ore blocks are all Roihan blocks, Attapulgite blocks and Australian blocks, the amplitude of the change of the two parameters is very similar. The variation trend and the amplitude of the two pellets are basically the same.
In fig. 8, the droplet characteristic values and the change laws of the reaction melting parameters of the sintered ores with different basicities are substantially the same, and sintered ore 2, sintered ore 3, sintered ore 4 and sintered ore 1. Since the basicity of the sintered ore 4 and the sintered ore 1 are not greatly different, respectively 2.05 and 2.00, the droplet characteristic values are respectively 114 and 91, and the reaction melting parameters are respectively 4.84 and 6.30, it can be considered that the difference between the two fluctuates in a small range. The magnitudes of the changes in the two parameters can also be considered to be very similar for sintered ores.
The reaction melting parameters only reflect the melting characteristics of the furnace charge in the reduction reaction, and the load melting droplet experiment also comprises load, pressure and other factors. Therefore, the reaction melting parameters and the characteristic values of the molten drops have the same change rule and similar amplitude in the single charging materials of the same variety, but the change amplitude of the single charging materials of different varieties has larger difference, which is related to the respective main oxide compositions in the single charging materials.
In conclusion, the characteristic numbers of the molten drops and the reaction melting parameters of the single iron-containing furnace burden of the same variety have better consistency in representing the reflow characteristics of the furnace burden in the blast furnace.
Table 14 shows the characteristic numbers of the molten drops and the parameters of the reaction melting for the mixed burden of a blast furnace of a certain enterprise
TABLE 14 molten drop characteristics and reaction melting parameters of the blended charges
Figure GDA0002473824260000091
FIG. 9 is a graph showing the characteristic number of molten drops of a mixed charge of a blast furnace of a certain enterprise compared with the parameters of reaction melting.
As can be seen from Table 14, for the mixed charge corresponding to charge structure 1 and charge structure 2 used in the blast furnace production of a certain enterprise, the reduction reaction melting parameter was increased from 4.18 to 6.67, and the droplet characteristic value was increased from 229 KPa.degree.C to 258 KPa.degree.C. For schemes 1-4, as the proportion of altremite used instead of australian ore was increased, the reduction melting parameters were increased from 11.20 to 14.18, 15.73 and 19.96, and the droplet feature numbers were also increased from 289 KPa. deg.C to 395 KPa. deg.C, 403 KPa. deg.C and 427 KPa. deg.C.
Therefore, the characteristic numbers of the molten drops of the mixed furnace materials with different furnace material structures and the reaction melting parameters have the same change rule and the same change amplitude. The characteristic number of molten drops of the blast furnace mixed iron-containing burden is well related to the reaction melting, and the characteristic number is related to the type and the proportion of oxides in different burden structures of the blast furnace.
By the above comparative experiments it can be concluded that: the traditional load molten drop test method for optimizing the blast furnace burden structure and the reduction reaction melting characteristic adopted by the method are better in consistency of characterization of a single iron-containing burden on natural iron ore blocks, sintered ores and pellets, and characterization of a single iron-containing burden and a load molten drop test; the method has good consistency on the representation of the mixed iron-containing furnace burden used by the blast furnace of the enterprise.
In practical application, different iron-containing furnace materials are respectively subjected to reduction reaction melting tests to obtain melting parameters RHFForming the melting parameter RH of various iron-containing furnace charges in different proportionsFA database of (a); establishing corresponding relations between different proportions of iron-containing furnace burden and the reflow property; and adjusting the proportioning structure of the iron-containing furnace burden in the blast furnace ironmaking process according to the database, thereby improving the high-temperature molten drop characteristic of the iron-containing furnace burden.
While several embodiments of the present invention have been presented herein, it will be appreciated by those skilled in the art that changes may be made to the embodiments herein without departing from the spirit of the invention. The above examples are merely illustrative and should not be taken as limiting the scope of the invention.

Claims (6)

1. The method for measuring the reflow property of the iron-containing furnace burden is characterized in that the iron-containing furnace burden is ground into a sample; determining the reflow property of the iron-containing furnace charge by using the relative change degree of linear displacement after the maximum expansion amount of the sample in the reduction reaction melting experiment as a characteristic quantity;
the characteristic quantity is a melting parameter RHFThe calculation formula is as follows:
RHF＝ΔT/T1×ΔH×100 (1)
wherein: t is1For melting shrinkage onset temperature, T2The temperature interval delta T is T as the end temperature of the reflow2-T1，H1The shrinkage height H of the sample material column when the maximum shrinkage is reached for the first time in the reflow process2The displacement change rate is the displacement change rate when the sample material column generates maximum expansion in the reaction process, and is delta H ═ H2/H1。
2. The method of claim 1, wherein the iron-containing charge and coke are ground to particle size to prepare the sample<147 μm, respectively making into cylindrical samples on a high-pressure tabletting machine
Figure FDA0002473824250000011
Figure FDA0002473824250000012
And a gasket sample with the diameter of 24mm × 4mm, wherein the coke content is 0-30% of the total mass of the sample.
3. The method of claim 1 or 2,
respectively carrying out reduction reaction melting tests on different iron-containing furnace materials and obtaining melting parameters RHFForming the melting parameter RH of various iron-containing furnace charges in different proportionsFA database of (a); establishing corresponding relations between different proportions of iron-containing furnace burden and the reflow property;
and adjusting the proportioning structure of the iron-containing furnace burden in the blast furnace ironmaking process according to the database, thereby improving the high-temperature molten drop characteristic of the iron-containing furnace burden.
4. The method of claim 1 or 2, wherein the iron-containing charge comprises a single ore of natural iron ore blocks, sinter ore, pellets, or a mixture of natural iron ore blocks, sinter ore, pellets.
5. A method according to claim 1 or 2, wherein the method employs a test device comprising: the device comprises a high-temperature furnace, a sample table, a slide system for pushing the sample table, a temperature measuring system, a camera shooting and recording system, an air supply system and an information processing device;
the slide system sends the sample platform into or out of the high-temperature furnace, the gas supply system supplies gas for the high-temperature furnace, the thermocouple provides a heat source for the high-temperature furnace, the camera or the video camera shoots the change state of the sample in the test process, and the picture information is transmitted to the information processing device; the temperature measuring system inputs the temperature information into the information processing device through the signal converter.
6. The method of claim 5, wherein the furnace is a visual horizontal furnace rated at 8 kw.
CN201811075382.9A 2018-09-14 2018-09-14 Method for measuring reflow property of iron-containing furnace burden Expired - Fee Related CN109211631B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811075382.9A CN109211631B (en) 2018-09-14 2018-09-14 Method for measuring reflow property of iron-containing furnace burden

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811075382.9A CN109211631B (en) 2018-09-14 2018-09-14 Method for measuring reflow property of iron-containing furnace burden

Publications (2)

Publication Number Publication Date
CN109211631A CN109211631A (en) 2019-01-15
CN109211631B true CN109211631B (en) 2020-07-03

Family

ID=64983507

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811075382.9A Expired - Fee Related CN109211631B (en) 2018-09-14 2018-09-14 Method for measuring reflow property of iron-containing furnace burden

Country Status (1)

Country Link
CN (1) CN109211631B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2714522C1 (en) * 2019-05-14 2020-02-18 Федеральное государственное бюджетное образовательное учреждение высшего образования "Алтайский государственный аграрный университет" (ФГБОУ ВО Алтайский ГАУ) Method of determining process temperature of charge melting during induction surfacing
CN110849931A (en) * 2019-12-05 2020-02-28 中冶华天工程技术有限公司 Visual determination device and determination method for iron ore softening and melting performance
CN117660714B (en) * 2023-11-20 2024-05-31 北京科技大学 Device and method for researching solid-liquid competition reduction of molten iron oxide of carbon

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103994997A (en) * 2014-05-15 2014-08-20 首钢总公司 Method for detecting soft heating property of iron-containing raw material for blast furnace
CN107101898A (en) * 2017-04-11 2017-08-29 北京科技大学 A kind of method for determining Sinter strength characteristic number

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202066813U (en) * 2011-05-20 2011-12-07 重庆科技学院 Iron ore high-temperature molten drop determination device
CN102890098A (en) * 2011-07-22 2013-01-23 宝山钢铁股份有限公司 Analytical method for iron ore high-temperature soft melting characteristics
CN102925601A (en) * 2012-10-24 2013-02-13 北京科技大学 Method for evaluating high-temperature softening-melting dropping properties of iron-bearing burden
CN104131121A (en) * 2014-07-23 2014-11-05 宣化钢铁集团有限责任公司 Method for eliminating iron making furnace charge load softening test detection error
CN104878138A (en) * 2015-05-04 2015-09-02 南京钢铁股份有限公司 Method for determining softening dropping property of blast furnace comprehensive burden
CN105463188B (en) * 2015-11-27 2017-11-17 北京科技大学 A kind of method for determining iron ore powder sintering Liquid phase flowability energy
CN107421978B (en) * 2017-07-12 2019-12-03 重庆大学 A method of judging iron ore reflow conductor roll
CN107543777A (en) * 2017-10-11 2018-01-05 辽宁科技大学 The test device and method of blast furnace ferrous furnace charge soft melting dropping characteristic

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103994997A (en) * 2014-05-15 2014-08-20 首钢总公司 Method for detecting soft heating property of iron-containing raw material for blast furnace
CN107101898A (en) * 2017-04-11 2017-08-29 北京科技大学 A kind of method for determining Sinter strength characteristic number

Also Published As

Publication number Publication date
CN109211631A (en) 2019-01-15

Similar Documents

Publication Publication Date Title
CN109211631B (en) Method for measuring reflow property of iron-containing furnace burden
Kasai et al. Reduction of reducing agent rate in blast furnace operation by carbon composite iron ore hot briquette
CN104388613B (en) A kind of method of blast furnace crucibe activity quantitative assessment
US8211204B2 (en) Self-fluxing pellets for blast furnace and method for manufacturing the same
US11493273B2 (en) Device and method for measuring softening and melting performances of iron ore in blast furnace under reducing condition
Shen et al. Effect of magnesia on the compressive strength of pellets
JP5455813B2 (en) Method for evaluating reduced powder properties of sintered ore
US10337078B2 (en) Solid agglomerate of fine metal particles comprising a liquid oily lubricant and method for making same
CN117470721A (en) Method for measuring and evaluating high-temperature degradation strength and granularity degradation behavior of metallurgical coke
Kashihara et al. Effect of unconsumed mixed small coke on permeability in lower part of blast furnace
JPH1161284A (en) Evaluation test method of reduction degradation characteristic of sintered ore
CN102471822B (en) Unfired carbon-containing agglomerate and production method therefor
JP4971662B2 (en) Blast furnace operation method
Liu et al. Optimization of iron ore blending in the COREX shaft furnace
CN114638516A (en) Comprehensive quality evaluation method for thermal performance of tamping coke for blast furnace
Hooey et al. Evaluation of operational data from the LKAB experimental blast furnace
KR101377773B1 (en) Method for predicting size of cokes
Liu et al. New Techniques to Measure Softening and Melting Properties of Mixed Burdens of Lump Ore and Sinter
EP2495339A1 (en) Method for operating blast furnace
JP2023018430A (en) Estimation method of cohesive zone slag amount in blast furnace and operation method
JP2023131283A (en) Reduced pellet production method
Eklund et al. Operation at high pellet ratio and without external slag formers–trials in an experimental blast furnace
BÖLÜKBAŞI Analysis of Iron Ore Sinter Technological Test Results
Liu et al. University of Newcastle Research Online nova. newcastle. edu. au
CA2882600C (en) Solid agglomerate of fine metal particles comprising a liquid oily lubricant and method for making same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200703

CF01 Termination of patent right due to non-payment of annual fee